Simultaneous EXOSAT-IUE observations of NGC 4151

NGC 4151 was observed four times in November 1983. The results indicate that: (1) there exists a correlation between the X-ray and UV fluxes on the long term; (2) the soft X-ray excess between 0.1 and 1 keV is probably steeper than expected from the leaky absorber model by Holt et al. (1980); and (3...

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Bibliographic Details
Published in:Space science reviews 1985-04, Vol.40 (3-4), p.593-596
Main Authors: Perola, G.C., Altamore, A., Boksenberg, A., Bromage, G.E., Clavel, J., Elvius, A., Penston, M.V., Pettini, M., Piro, L., Snijders, M.A.J., Tarenghi, M., Ulrich, M.H.
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Language:English
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Summary:NGC 4151 was observed four times in November 1983. The results indicate that: (1) there exists a correlation between the X-ray and UV fluxes on the long term; (2) the soft X-ray excess between 0.1 and 1 keV is probably steeper than expected from the leaky absorber model by Holt et al. (1980); and (3) the spectral fit to the ME data, after correction for a soft component, yields an alpha value of 1.73 + or - 0.27, N(H) = (15.2 + or -2.2) x 10 to the 22nd/sq cm, E.W. (Fe line) = 0.208 + or - 0.084 keV, and does not require a strong overabundance of Fe in the absorber. The relationship beween N(H) and the strength of the broad emission lines is commented upon.
ISSN:0038-6308
1572-9672
DOI:10.1007/BF00179871